Rodolpk6

I was wrong I will correct this right away I thought 7 inches was 210 mm, but why you don't have a metric system Yet I find them quite tight, what was obvious was the empty box, the very soft bass, I filled half of them with foam

Good evening So I opted for the modification of the upper body, 2 half days, some photos to illustrate. I half filled the top box with foam because the basses were too present. Really the result is great, the basses are still as fast and more than enough to listen to music as an audiophile. Here is the measurement of the same left speaker tweaked in green and not tweaked in vioolet, exactly at the same place, for the rest I must be able to soften with roon Rodolphe

Au fait savez comment on enlevé les 4 grilles basses, c'est vissé de l'intérieur? Rodolphe

I picked up a pair of Belle in perfect condition from 1980 with AA crossover, I went to Italy to pick them up. Plugged in and listened to for 2 hours. It's something else than rf7 lll, the sound fills the room and you really want to push the volume, I'm delighted. Maybe a lack of extreme bass so I'm going to be looking for a subwoofer and I'm going to need some advice, knowing that on my preamp I only have one RCA output? A Photo Rudolph Translated with www.DeepL.com/Translator

Merci pour toutes ces réponses mais je viens de changer et je suis tombé amoureux d'une paire de Belle et lundi je vais les chercher en Italie je vais parcourir 1500 km. Ils datent de 1980 et sont en parfait état. Je mettrai des photos dès que je les aurai, je changerai d’abord les condensateurs. Cordialement, Rudolph

C'est type AA et j'ai commandé ALK Universal mais 8 semaines de délais...

Thank you for all these answers but I just changed and I fell for a pair of Belle and Monday I will pick them up in Italy I will drive 1500 km. They are from 1980 and in perfect condition, I'll put pictures in as soon as I get them, I'll change the capacitors first. Yours sincerely Rudolph

Merci beaucoup pour le contact de George. Bonne journée

Thank you for all these explanations, so for medium and tweeter it may not be necessary to change the diaphragms despite their age, given the investment is it not wise to do so? For crossover, I only change the capacitors (I have a device that allows me to test Esr) directly at Bob's or can we put better ones? With the RF-7 llls, I have very good bass and I'm used to it. If I can go down to the Scala with the Bass reflex mod and use Roon to equalize. I don't see how to put a Sub on my system, because the "Lightspeed attenuator" preamp has only one input and one RCA output Translated with www.DeepL.com/Translator

I thought I would go directly through a universal ALK, probably change the diagrams and maybe replace the 33 with a KAPPA PRO-15LFC. and later make a Bass Reflex Mod either underneath or in the upper part by closing the back of the upper part, as suggested here by Marwel: Original text from Dennis: The taper rate of a LaScala is 100hz,The mouth area is good for 125hz. Below this it is a big woofer in a small sealed box.If we plug the T/S parameters for the K33E into a box program we will see that the Qtc=.85, the Fc=82.5hz, and the F3=70.9hz. If we close in the back of the high frequency cabinet and open the woofer rear chamber up into this volume and fill with fiberglass we now have Qtc=.577, Fc=58.2hz, F3=73.6hz . Bessel=Qtc.577=D2 gives the best transient response and the least group delay of all the sealed boxes.At 30hz the Qtc=.577 has 4.5dB more output than the Qtc=.85 . Compared with sealed enclosures,the transient performance of the best vented enclosure is worse than the best sealed box enclosure.Since we have made great gains in performance some may elect to stop here.But please read on.The next step is to port it. The K33E is not the optimum woofer for this but it works pretty good. With the box size optimized for a D2 we can port the stock woofer to an SC4.The transient response of an SC4 while not as good as an SBB4(more on this later)is better than the more common QB3. Unequalized the F3=49hz and has 3dB more output at 30hz than the D2. The response curves are parallel with the D2 the only difference being the Fc being a half octave lower with the SC4 and the output being 3dB higher from 30~70hz. The output of the SC4 does not drop lower than the D2 until you go below 17hz. Again this may be a stopping point for some. But by adding a simple two pole high pass filter ahead of the power amp we can now have a C6 with a -3dB point of 31hz. Since this is the Fb of the system there is no increase in cone excursion or distortion. The filter consists of a cap, an inductor and a pot. The pot allows adjustment at Fb of +/- 3dB. This is similar to being able to change the Qtc of a sealed box from .5~1.0 .If you think about it we have the choice between a D2,SC4,and a C6 in the same box by plugging the port and/or bypassing the eq. If you have a SET amp or simply want to get the most out of the LaScala you will want to upgrade the woofer to something with a lower Qts. The Klipsch K43E does the trick, as do the EV DL15W and the JBL 2205. The EV and JBL drivers require some minor network changes. The lower Qts drivers allow for an SBB4 alignment which has the best transient response of the vented alignments. With no eq they have 3dB more output at 30hz than the stock woofer. With eq we have a maximally flat B6 and the F3 of the system is 27~28hz. If using a solid state amp with the low Qts woofers a small resistor must be added in series with the driver to have the same Rg as the SET does. This mod can be backed out of a stock LaScala with no externally visible changes if you don't like it. No one has ever gone back to stock after hearing this mod.

Thank you for your answer, I'll get them back soon and I'll post some precise photos to find out for sure. It seems that the vertical central wood is there to hold the central grids, a little like in La Belle.

Yes, it looks like it was in the factory. I have a picture with a serial number, letter N which corresponds to 1975

Thank you for your answer, but maybe you misunderstood my question (I go through Deepl) I currently have a pair of RF7 llls at home that you can see in the picture. I plan to change it for a pair of Scala that we see at the seller, 3 photos, my main question is whether the Scala are original, what troubles me is the vertical wood in the center and the 4 grids in lower parts. I didn't see any Scala that looked like that. Translated with www.DeepL.com/Translator

That's what I'm listening to, in a balanced room Serveur PC fanless i7 (Roon Rock) Qobuz Hi-res >Streamer Ambre (Metrum) >2 Switch tweakés Fento c2 mk2 >Dac Topping D70 >Pré Ampli passif Light speed attenuator >Ampli 2 blocs Jadis JA 30 Chromés 1984 tubes EL503 > Enceintes Klipsch RF7 III

Hello New on the site I am in France and I will buy a pair of Scala with the letter N so 1975 with AA filter, but I put some pictures because there are grids in the lower part and a vertical wooden element in the center a little like a Belle in smaller. I've never seen this before, the seller tells me it's 100% original. I call on the experts to check it out. It is to replace RF7 llls, driven by two Jadis blocks from 1984 with EL503 tubes and a preamplifier The Lightspeed Passive Attenuator designed by George Stantscheff . Yours sincerely Rudolph Translated with www.DeepL.com/Translator